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Familial dopa-responsive cervical dystonia.
S A Schneider1, M D Mohire, I Trender-Gerhard
1Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, UCL, London, UK.
Neurology
|March 1, 2006
Summary
Young-onset cervical dystonia responded dramatically to levodopa in four patients from two families. Genetic testing was negative, suggesting potential new forms of dopa-responsive dystonia. Levodopa is recommended for early-onset cervical dystonia.
Area of Science:
- Neurology
- Genetics
- Movement Disorders
Background:
- Dopa-responsive dystonia (DRD) is a rare genetic disorder typically presenting in childhood.
- Cervical dystonia is a common form of focal dystonia, characterized by involuntary contractions of neck muscles.
Observation:
- Four pediatric patients from two unrelated families presented with young-onset cervical dystonia.
- Symptoms included predominant cervical dystonia, postural hand tremor, and laryngeal dystonia.
- Onset age ranged from 9 to 15 years, with a mean of 12 years.
Findings:
- All patients exhibited a dramatic and sustained response to levodopa treatment.
- Genetic testing for known DRD-associated genes (GTP cyclohydrolase I, tyrosine hydroxylase, sepiapterin reductase) was negative.
- These findings suggest the possibility of novel genetic forms of dopa-responsive dystonia.
Implications:
- Levodopa should be considered in the management of all patients diagnosed with young-onset cervical dystonia.
- Further research is warranted to identify the genetic basis of these newly observed DRD cases.
- Early diagnosis and treatment with levodopa can significantly improve outcomes for patients with this condition.